20186138 has 12 divisors (see below), whose sum is σ = 35222922. Its totient is φ = 8651160.

The previous prime is 20186137. The next prime is 20186141. The reversal of 20186138 is 83168102.

It can be written as a sum of positive squares in only one way, i.e., 12694969 + 7491169 = 3563^2 + 2737^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20186138.

It is not an unprimeable number, because it can be changed into a prime (20186137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102893 + ... + 103088.

Almost surely, 2^20186138 is an apocalyptic number.

20186138 is a deficient number, since it is larger than the sum of its proper divisors (15036784).

20186138 is a wasteful number, since it uses less digits than its factorization.

20186138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205997 (or 205990 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20186138 is about 4492.8986189319. The cubic root of 20186138 is about 272.2812564335.

The spelling of 20186138 in words is "twenty million, one hundred eighty-six thousand, one hundred thirty-eight".